• GARGI RAINA

      Articles written in Bulletin of Materials Science

    • An atomic force microscope study of carbon onions and related nanoparticles

      Gargi Raina Rahul Sen

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      Carbon onions are found along with carbon nanotubes and other carbon nanoparticles in the cathodic deposit in the arc-vaporization of graphite. Atomic force microscopy has been used to characterize these particles on the basis of their sizes and shapes. Onion-like particles have three-dimensional, near spherical structure and are distinct from two-dimensional graphitic particles. The spherical shape and height to diameter ratios obtained using atomic force microscope, afford a distinction between onion-like structures and other carbon nanoparticles.

    • Efficient surface plasmon propagation on flexible free-standing and PMMA sandwiched graphene at optimized near to far-IR frequencies

      GEORGE JACOB GARGI RAINA

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      Graphene is an important material for the design of flexible and stretchable electronic and optoelectronic devices on account of its high Young’s modulus and generation of highly confined surface plasmons. In this work, we report the near to far-infrared (FIR) input frequencies required to generate the maximum electric field and magnetic field for the efficient propagation of surface plasmons for differently doped, micron-long, free-standing and poly(methyl methacrylate) (PMMA) sandwiched graphene sheets. The effect of the variation of doping of graphene, graphene sheet length and bent angle of the graphene sheet on the propagating electromagnetic field is analysed at the obtained inputexcitation frequencies using finite element method. Low attenuation of 0.034 and 0.234 dB along with relatively high confinement of $\sim$6 and $\sim$13 nm for the surface plasmons are achieved for micron-long, bent, highly doped, freelysuspended and PMMA sandwiched graphene sheets at 193.5 and 190 THz, respectively. The knowledge of these optimized NIR–FIR input excitation frequencies producing maximum electric and magnetic field output at the end ofgraphene sheet is useful for designing compact and efficient graphene-based flexible and wearable devices for medical imaging applications.

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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